SHEET /m/iron-ii-sulfate · PubChem CID 24393 · CAS 7720-78-7 · REV 2026.07
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Iron(II) sulfate from source
FeO4S · 151.91 g/mol
FERROUS SULFATE · Ferrous sulphate · Iron(2+) sulfate · Ferrous sulfate anhydrous
chemical compound
CategoryNutrient
Fig. 1 · 2D structure RDKit
[O-]S(=O)(=O)[O-].[Fe+2]
Where you'll find it
Not yet mapped to everyday foods or products.
The dose makes the poison inferred
A reported rat oral LD50 for Iron(II) sulfate is 319 mg/kg, the dose lethal to half the animals tested. Scaled by body mass alone:
22.3 g
a median lethal dose scaled to 154 lb (22,330 mg)
“The dose makes the poison” is a cross-species estimate shown as neutral science, not a threshold anyone should act on. Real toxicity depends on the person, not body mass alone.
Toxicity & hazards
Toxicity · LD50
319 mg/kg · low toxicity · LD50 rat oral from source
The dose lens above scales this to a body weight.
3 more reported values
- 1,520 mg/kgLD50 · oral · mouse
- 65 mg/kgLD50 · iv · mouse
- 155 mg/kgLD50 · dermal · rat
WarningIrritantH302, H315, H319from source
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